router
SwitchDescription: Network Switch a device that seperates the Broadcast domain of a LAN segment from other segments.
No
Since a router does not forward broadcast messages it automatically splits up the broadcast domains for all clients connected to them.
On shared-media networks (i.e. hubs or pure ethernets), routers break up broadcast domains and bridges break up collision domains. Routers also break up collision domains. On switched networks, routers break up broadcast domains, and every switch port is its own separate collision domain.
NO
A Router
To determine the number of collision and broadcast domains in a network topology, one must analyze the devices involved. Each switch creates separate collision domains for each connected device, while a router or Layer 3 switch creates separate broadcast domains. Without a specific topology diagram or description, it's impossible to provide an exact count; however, generally, each switch adds collision domains, and each VLAN or router adds a broadcast domain.
YES
A broadcast domain is created any time you connect several clients together via a network connectivity device, such as a hub or switch or bridge. They would all be in the same broadcast domain for every client connected to them. Since a router does not forward broadcast messages, it creates different broadcast domains.
VLAN
ROUTER!
VLAN